@Override
 public boolean equals(
     final MethodSignatureBackedByPsiMethod s1,
     final MethodSignatureBackedByPsiMethod s2) {
   return s1.getMethod().equals(s2.getMethod());
 }
 @Override
 public int computeHashCode(final MethodSignatureBackedByPsiMethod signature) {
   return signature.getMethod().hashCode();
 }